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Signs of mice in Western U.S. homes

Have you heard scratching noises or noticed an unusual, ammonia-like smell in your home? Then you may have mice in your property. Mice are usually nocturnal and can remain hidden for a long time before you even begin to suspect a problem. Whether you’re hearing scratching in the walls or spotting torn food packaging, learning to recognize the early signs of mice in your house is the first step to getting rid of mice.

If you think you have mice in your home, contact Western Exterminator’s mouse control technicians for expert pest control services.

The most common signs of a mouse infestation

Here are some common signs of mouse activity to look for in your property:

  • Droppings - Mice will excrete 50-80 tiny droppings per night. You may find them inside or on top of cupboards or along floorboards. In the early stages of a mouse infestation, you might notice other clues before spotting mouse droppings, like scratching sounds or musty odors. It's quite possible to see signs of mice, but no droppings if they’ve only recently infested your property or nest in hidden areas.
  • Grease marks - These marks are caused by mice brushing against walls, floors and floorboards on regular routes. Look for dark smears around holes or around corners. 
  • Urine pillars - In established or heavy infestations, body grease, combined with dirt and urine, builds up into small mounds – up to two inches high and half an inch wide. 
  • Scratching noises - At night when mice are most active, you may hear gnawing, squeaking, scurrying, or scratching noises. Listen for sounds of mice in walls, under floorboards, in false ceilings, and in basements or lofts. 
  • Nests - Using easy-to-shred materials, mice build nests in lofts, suspended ceilings, cavity walls, behind fridges, and under floorboards, stoves, and cabinets.
  • Tracks/footprints - Dusty environments such as unused lofts and basements can reveal rodent tracks and tail marks. To check for activity, sprinkle flour or talcum powder and see if there are fresh tracks the next day. 
  • Live or dead mice - Spotting a mouse during the daytime can be an indication of a heavy infestation. 
  • Strong smell - Mice urinate frequently and their urine has a strong ammonia-like smell that lingers for some time. The stronger the smell the closer you are to mice activity. 

If you find signs of mice in your house, our mouse exterminators are able to confirm the presence of mice and offer targeted and effective treatments to help resolve any issues with mice. Call 800-937-8398 or click the button below to contact us online.

 

 Signs of mice in specific areas of your home

Mice are agile and inquisitive creatures, able to use their flexible skeletons to squeeze into the tiniest spaces. Here are some common places you might find mice hiding within a home.

One of the most common complaints is hearing signs of mice in walls, especially at night. You might hear soft scratching or movement in the drywall, particularly near kitchens, garages, or laundry rooms.

If you’re hearing noises overhead, especially in the evening or early morning, it could be signs of mice in your attic spaces. Attics often provide warmth and shelter, and crawl spaces near foundations are also common hiding spots.

Finding signs of mice in air ducts is less common but can happen, especially if vents are accessible or poorly sealed. Mice in ducts can cause odor, damage insulation, and leave droppings that could circulate allergens.

Though rare, people occasionally report signs of mice in bedroom furniture or even signs of mice in mattress seams, usually identified by soft scratching sounds or gnaw marks. These are often traced back to clutter under beds or food left in nightstands.

 

Have you noticed signs of a mouse infestation in your home? Visit our mouse control page to book an appointment with our trained technicians.

Where to look for mice outside the home

It's a misconception that mice are only a winter problem—many types of Western U.S. mice are active all year round. So, where outside your home should you start checking for signs of mice? 

Sheds

Check the base of wooden doors for gaps and gnaw marks. Field mice are more likely to enter sheds and outbuildings in search of stored food.

Compost bins

Compost heaps attract mice because they are warm and contain food. Check the lid and base of composters for holes and gnaw marks.

Garages

Check for gaps around door frames or holes gnawed at the bottom of wooden doors. Inspect the internal door inside the garage as well, and any vents that could give entry into other internal areas.

Vegetation

Overgrown vegetation, especially located near walls, may be used by mice for shelter and to nest. Vines, shrubs and overhanging branches close to a property can function as a bridge for mice to reach entry points in the eaves or on the roof.

Why do I have mice?

House mice are one of the most common pests for residents. Just because a house gets mice does not mean it is dirty or unclean. Mice are looking for shelter, a place to nest, a place to breed, and easy access to food. If they can find those things in your home, they’ll find any way they can to get inside. If mice get close to a home, they have no problem using their strong teeth to chew through wood and even siding. Older homes are especially vulnerable due to aging foundations, worn-out seals, and structural gaps – learn more about why rodents infest older homes.

What to do if you suspect mice in your home

Seeing signs of mice in your home? Don’t wait to take action. A small problem can turn into a full infestation faster than you think. Call the mice control experts at Western Exterminator at 800-937-8398 to help get rid of mice from your home or business.

 

Frequently asked questions

Cleaning helps, but it’s not a guaranteed solution. While a clean space removes food and nesting materials, mice won’t always leave on their own—especially if they’ve already found shelter. Cleaning is a good preventive step, but you’ll likely still need professional help to fully remove them.

Mice are drawn to easy food, warmth, and safe hiding places. Crumbs, open food containers, pet food, and even cluttered storage areas can all bring them in. Gaps around doors, vents, and pipes also make it easier for them to get inside.

Some of the first signs include scratching sounds in walls or ceilings, small mouse droppings near baseboards or food, and chewed packaging. You might also notice a musty smell in enclosed spaces. Spotting these signs early gives you a better chance of catching the problem before it grows.

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